package com.ktz.shoping.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

@WebFilter("/*")
public class EncodingFilter implements Filter {
	String encoding = "";
    public EncodingFilter() {
    }

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		if("GET".equals(req.getMethod())){
			req = new EncodingRequestWrapper(req, encoding);
		}else {
			request.setCharacterEncoding(encoding);
		}
		response.setCharacterEncoding(encoding);
		chain.doFilter(req, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
		encoding = fConfig.getInitParameter("ENCODING");
		if(encoding==null||"".equals(encoding)){
			encoding = "UTF-8";
		}
	}

}
